Polytronics Technology Corporation

Hsiu Che Yen

Yao Te Chang

Yung Hsien Chang

Zhen Yu Dong

Fu Hua Chu

David Shau Chew Wang

Takashi Hasunuma

Pin Syuan Li

An over-current protection device comprises first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer comprises a polymer matrix and carbon black. The polymer matrix comprises a fluoropolymer having a melting point higher than 150&#xb0; C. The carbon black is dispersed in the polymer matrix. A resistance jump Rof the over-current protection device at 16V/50 A by 1000 cycles is 0.80-1.20. A resistance jump Rof the over-current protection device at 25V/50 A by 1000 cycles is 0.90-1.30.

Over-current protection device

An over-current protection device comprises first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer comprises a polymer matrix, a conductive ceramic filler, a carbon-containing conductive filler, and an inner filler. The polymer matrix comprises a fluoropolymer having a melting point higher than 150&#xb0; C. The inner filler is selected from one of aluminum nitride, silicon carbide, zirconium oxide, boron nitride, graphene, aluminum oxide, or any mixtures thereof, and comprises 2-10% by volume of the PTC material layer. The over-current protection device is able to mitigate negative temperature coefficient (NTC) behavior after trip of device, and achieves high hold current and high endurable power.

A cable comprises a power conductor, a data conductor and a first PTC device. The power conductor is configured to transmit electrical power between a source and a sink. The data conductor is configured to transmit data between the source and the sink. The first PTC device is coupled to the data conductor and its resistance increases drastically to decrease current flowing through the data conductor if a temperature of the first PTC device exceeds a first trip temperature. The first trip temperature is 55-80&#xb0; C. The resistance of the PTC device is larger than 20 k&#x3a9; at 85&#xb0; C. and larger than 80 k&#x3a9; at 100&#xb0; C. A current flowing through the data conductor does not exceed 20 mA.

Cable with over-temperature protection

An over-current protection device comprises first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer has a resistivity less than 0.05 &#x3a9;&#xb7;cm and comprises a polymer matrix, a conductive ceramic filler and a carbon-containing conductive filler. The polymer matrix comprises a fluoropolymer having a melting point higher than 150&#xb0; C. and comprises 50-60% by volume of the PTC material layer. The conductive ceramic filler having a resistivity less than 500&#x3bc;&#x3a9;&#xb7;cm is dispersed in the polymer matrix and comprises 40-45% by volume of the PTC material layer. The carbon-containing conductive filler is dispersed in the polymer matrix and comprises 0.5-5% by volume of the PTC material layer. At 25&#xb0; C., a ratio of a hold current to an area of the over-current protection device is 0.21-0.3 A/mm, and a ratio of an endurable power to the area of the over-current protection device is 4.8-7.2 W/mm.

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Hsiu Che Yen